Mr. Letterman, who in May stepped down as the host of CBS’s “Late Show,” made a surprise appearance on Friday night at the Majestic Theater in San Antonio, Tex., and talked about Donald Trump’s presidential campaign.

The Tony Award-winning actors Bernadette Peters and Martin Short will meet with a team of theater producers this month to discuss a possible Broadway revival of ''I Do! I Do!,'' the 1966 Tom Jones-Harvey Schmidt musical about the trials and...